MODEL7302 User Manual
Page 3 of 10
1. Introduction
MODEL7302 FE1 Fiber Modem is a high-performance E1 fiber optic modem developed by
using a dedicated integrated circuit. It is to modulate a framing or non-framing E1 data signal
directly into single- or multi-mode optic fiber for a transmission via optic cable line. At
another end of the optic cable, optical signal is demodulated into a framing or non-framing E1
data signal. E1 interface may be directly connected with the E1 interfaces of image and data
terminals or the WAN ports of MUX, exchanger and router for a dedicated network setup or a
LAN connection.
2. Product Features
Conforms to all relevant ITU series standards( ITU-T G.703 G.704 G.823)
Transmit one E1 channel
Framing or non-framing mode in option
E1 time slot in arbitrary option
Balanced 120Ω/non-balanced 75Ω interfaces automatic
Support the loop back of local analog/digital interface
Support remote loop back function (valid on under framing mode)
Support pseudo-random code test function, providing convenience for the test of optic
fiber line status
120km trunking -free transmission distance for single-mode optic fiber
Capable to be communicated with V.35 fiber modem
Available with complete line detection and alarm indications
Available with independent structure and 19-inch frame-mounted structure
(frame-mounted structure can be inserted with 16 modules);
AC 220V and DC –48V inputs may be selected for fiber optic modems of both structures;
For frame-mounted fiber optic modems, dual power supply heat backup is provided to
ensure a Receiving level
：
0~-43db
3. Specifications
Optic interface:
Line mode type: CMI
Line mode rate: 2.048Mbps
Operating wavelength:850nm,1310nm or 1550nm
Optic fiber connector: SC/PC
Applicable optic fiber: multi-mode, single-mode
Transmission distance:
Single-mode: up to 120km Multi-mode: up to 2km
E1 interface:
Standard: ITU-T G.703 G.704
Frame structure: framing CCS(PCM31)/ CAS(PCM30)
Rate:N×64Kbps (N=1~31)or 2.048Mbps
